Unloading device.



J. TRIBE.

UNLOADING DBVIGE. APPLICATION FILED: JAN. 22. 1906.

Patented June 1,1909. f

RECEIVER- WITNESSES:

fivm INVENTOR \BY' )z I: A'l'TORNET UNITED sTATnsrATnNT ()FFIGE,

JAMES TRIBE, Oh ltlILWAUKEE, \Vlbt'ONSIN. ASSIGNOR TO ALLIS-(JHALMERS COMPANY, OF MILWKUKEE, WISCOKH'IN, A (ORIORATION' 01 NEW JERSEY.

UNLOADING DEVICE.

Specification of Letters Patent.

Patented June 1, 1909.

application filed. January 22, 1906. Serial No. 297,174.

' ive, the slot of the link 9 riding along the Wisconsin, have invented certain new and useful Improvements in Unloading Devices, (Case 1%,) of which the following is a specification. r

This invention relates to control mcchanism and more particularly to a valve, actuating mechanism therefor, and means for pivotal connection with the arm 3, tendsto holding the valve.

This invention has utility when applied pin 7. When the receiver pressure falls to or below the required point, the 'llourdon tube 13 will tend toassume a contracted form. As the link 9 in its upward pull moves sutiicicntly to lift the arm it slightly, it thereby frees the lug or stop 12 from" the i link 13 and permits the tube 15 to withdraw the link 13. \Vith this link 12 withdrawn, the continuously effective means 4, having l close the inlet valve 1 and thus place the to pressure control of a valve, as the inlet j valve of a blower or compressor, in winch i relation 1t serves as an efiicient unloading device.

Referring to the drawings: Figure 1 shows an embodiment of the control mechanism as applied to a blowing engine; Fig. 2 is a detail ofthe holding device.

The rockable element 1 is the inlet valve and has an arm 2 connected by a link 3 to the resilient means or spring 4, which spring is connected to a fixed base plate The element 1 has a second arm 6 with a pin 7 engaging slot 8 of the link 9. The link 2) is pivoted on the wrist plate 10, which wrist plate is mounted on the cylinder 11. The arm 6 has a lug or block 12 thereon, which block is so positioned that the pivoted link or catch 13 mounted on the plate may move' into the path of the block 12 and thereby hold the element 1. against the re sistance of the spring 4. The link 13 is actuated through the rod 14- connected to some fluid actuated mechanism, as for example, the

Bourdon tube 15, which has connnunication through pipe it with a source of fillld pressure, stored in the receiver. The valve 1 with its arms 2 and (3 are virtually one element, and, accordingly, by this construction there 15 produced a device with few wearing parts.

Operation: \Vhcn the pressure in the receiver rises above the pressure required, the tube 15 is moved or straightened suliiciently to throw the rod 14, and thereby move the link 13 into the path of block 12. The link 13 upon engaging the block 12, holdsthe inlet valve 1 open against the resistance of the continuously efiective closing means 4, while the continuously operable valve opening means}? and 10 is alsorendered ineiiecti blower in regular operation to deliver from the compression stroke past the delivery *alve into the receiver instead of forcing the air back through the inlet valve, as in the case when link 13 holds the valve open. This link connection of the tension spring 4 with the arm 2 is such that its working angle is greatest the nearer the valve is to the end of its closing movement.

W hatclaimed and it is desired to secure by Letters Patent is:

1. The combination with an inlet valve,

of a spring one end of which stationary and the other end connected to said valve for moving said valve in-onc direction, a link provided with a slot one end of which engages the valve to positively move said valve in the opposite direction, a catch engagcable with said valve to prevent',its movement, and fluid actuated means to operate said. catch. 4

2. The combination with an inlet valve of anair compressor, a spring stationarily held at one end and secured tosaid valve at its other end whereby it may move said valve in one-direction, a link provided with a slot one end of which engages the valve to positively move said valve in the other direction, said valve being provided with a lug, a pivoted catch engageable with said lug to prevent said valve being moved by said spring or to be retained out of engagement with said lug to permit said valve to be moved by said spring, and fluid pressure actuated means secured td said catch for controlling its movement.

In testimony whereof I aflix my signature in presence of two witnesses.

' JAMES TRIBE. Witnesses "G. F. DE VVEIN,

Geo. E KIRK. 

